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I'm not clear on the specific type of tuber, but if it's a corm the rounded side should face up. Small bulbs, even if planted upside down will find their way to the surface. When in doubt, plant sideways.

This article has information on ferns.
https://www.gardeningknowhow.com/ornamental/foliage/ferns/taking-care-of-outdoor-ferns.htm
You can also contact the customer service from the company you purchased from to verify the variety and their specifics.

Plant the daffodils - they will be much better off in the ground - but make sure nice and deep - as people tend to plant them to close to the surface- at least 3 times the depth of the bulb. For the tulips - that is a trickey question- as a lot of animals and insect get to them in the ground,but best bet for both nice and deep in the soil. best place :)

There are several snails in Florida that attack gardens. It could be one of these:
http://entnemdept.ufl.edu/creatures/misc/gastro/terrestrial_snails.htm
http://entnemdept.ufl.edu/creatures/misc/white_garden_snail.htm

Removing them by hand is often the most effective method, but there are some other options:
https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/slug-snail-eggs.htm

It's getting late in the growing season in your zone for bulbs to come up this year. You can plant as many fall bulbs as you like, though! This article will tell you everything you need to know about planting bulbs:
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/how-long-for-bulbs-to-grow.htm

This sounds like two issues. First, the soil that you are using may not be "heavy" enough, or may contain too much perlite or other inert media that helps fluff up the soil. Try a heavier soil mix. This can help some.

The next issue at hand will be that there may not be enough drainage in the container. If there is not enough means by which to let out water, then this can cause the bulbs to sink as well. Try drilling more holes, or finding a container with better drainage.

This is an unfortunate situation, but it can be easily corrected. Container gardening is definitely a trial and error process.

Termites will not bother bulbs since they do not contain woody cellulose. They will nest in the soil but they will not eat the bulbs. You can prevent them with many different things that you already likely have in your home. This collection of articles will give you some ideas: https://www.gardeningknowhow.com/special/organic

As for the fungicide. Any dustable fungicide will be fine, but I prefer wettable sulfur and dolomitic lime together. This will keep the soil conditioned, and prevent fungal infections.